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OpenAI posted 372 families of AI math results, including a claimed Unique Games proof. About 42% have Lean checks, while mathematicians say the proofs are hard to read and want the model and prompts released.
Read full story →Anthropic released Claude Haiku 5.5 on Wednesday at $0.10 per million input tokens for prompts up to 100,000 tokens, the same rate OpenAI charges for GPT-6 Luna. The rate is 90% below Haiku 4.5 on those prompts, but Anthropic’s own estimate of the average saving is about 75%, once a tokenizer that counts roughly 30% more tokens for the same text is included. Anthropic is aiming it at high-volume work, including live customer support and browser use, and at subagent tasks handed down by Opus 5.5 and Sonnet 5.5. What Changed
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AI News
Reflection AI unveiled Beam, a 501-billion-parameter open-weight model it says matches China's GLM-5.2 on reasoning at three to four times less compute. Weights are due this month, no independent evaluation exists yet, and Reflection's own table shows Beam trailing newer Chinese models.
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SemiAnalysis fed War and Peace into paid accounts and read the usage meters. Opus 5.5 on Claude plans returns about five times the API-equivalent value of GPT-6.1 Sol on OpenAI's, a mid-tier gap that widened after OpenAI halved its $200 plan.
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